It is estimated that between 3.5 and 10% of the world population is afraid of needles, also called trypanophobia, and it is much more common in people between the ages of 5 and 17.
In this article we are going to examine the most common hypodermic needles used to vaccinate fish, their origin and recommendations for use.
A hypodermic needle (from the Greek ὑπο- (hypo- = under), and δέρμα (derma = skin)), is basically a very thin, hollow tube with a sharp, bevelled tip. [Wikipedia]
It is typically used in conjunction with a syringe to inject substances into a body (e.g. saline, vaccines, or medicinal fluids) or to extract fluids from a body (e.g. blood). In the case of fish, they are mostly used to draw blood or inject vaccine (intraperitoneally, and some intramuscularly).